Like many I am baffled by some opinions here. Tobias Albertine Maurits Alderweireld has been THE BEST central defender of Spurs team since Ledley King. Period.
Yes, it is unarguable fact that we have only lost only few games after he suffered the injury and there has not been a catastrophe. To put actual numbers here since his departure (and also the games he has missed after the brief comeback; so basically those are all the games where Toby did not run onto the field) at 21.11 we have lost 4 games (ManC; Scum; Juve and Leicester), drawn 6 (Newport, Pool, Soton, Wet Spam, Watford, West Brom) and won 15. So out of 25 games we won 60%. If someone asks "could we have won more when Toby would have been fully fit" - the answer is - "we could not know". No one could say we could have, no one can say we would have, this argument swings both ways. Out of those draws as well for example we let opposition team to score 9 goals and during those draws we never kept clean sheet! I mean you could say that if these all would have been 0:0's then our defence possibly could not have been better. But given 0 clean sheets and 1,5 goals let in per game, I kind of sense that we could have won more. We dont know but might have been.
I really would not want to loose Alderweireld as he is one of the few players in our team who is truly world top class in his position. Pleasure to watch really. BTW one thing that people seems to have forgot here are his good long balls out of the defence. That helps to create room for forward players as well, and again - we cannot know, maybe some of those draws could have ended differently.
Last season he missed 12 games out of total 53. Season before 0 games (was only rested in some domestic cups). This season has missed 25, so in that sense it is true that amount of games he has missed has increased. But I would not write him off just yet.
Anyways, the most important thing I want to say is that - him being out has not ended in catastrophy, but we are stronger team with him in the squad. Losing the best players in the position will inevitably weaken the team.